FMagicUnitsPerFoot

Oblivion uses a coordinate system with 'units' as the base form of measurement. When calculating areas of effect, Oblivion uses fMagicUnitsPerFoot to convert the 'feet' attribute of the area of effect into the equivalent units. The default value is 22.0000.

Units are discussed in more detail here: http://cs.elderscrolls.com/index.php?title=Oblivion_Units